In this paper, the effects of scaling ions (Ca(2+) and Mg(2+)) on corrosion and scaling processes of galvanized steel pipe in simulated geothermal water at 50 deg C are presented. Spherical corrosion products and needle-shaped scale coexisted on the pipe surface. The concentration of Zn(2+) and OH(-) affected the nuclei formation of scale. The corrosion products and scale were identified as Zn(OH)2, ZnO, CaCO3 and MgCO3, respectively. When scale formed on the galvanized steel pipe, the corrosion rate slowed down and the pitting region became smaller. The morphology of the specimen was examined using SEM. The corrosion products and scale were characterized through EDS and the phase structure was identified by XRD.
Effect of Ca(2+) and Mg(2+) on corrosion and scaling of galvanized steel pipe in simulated geothermal water
Einfluss von Ca(2+)- und Mg(2+)-Ionen auf Korrosion und Inkrustation von verzinktem Stahlrohr in simuliertem Geothermalwasser
Corrosion Science ; 52 , 7 ; 2244-2249
2010
6 Seiten, 10 Bilder, 6 Tabellen, 23 Quellen
Article (Journal)
English
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